Direct kinetic correlation of carriers and ferromagnetism in Co2+: ZnO

The hypothesis that high-Curie-temperature ferromagnetism in cobalt-doped ZnO (Co2+: ZnO) is mediated by charge carriers was tested by controlled introduction and removal of the shallow donor interstitial zinc. Using oriented epitaxial Co2+: ZnO films grown by chemical vapor deposition, kinetics mea...

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Bibliographic Details
Published inPhysical review letters Vol. 97; no. 3; p. 037203
Main Authors Kittilstved, Kevin R, Schwartz, Dana A, Tuan, Allan C, Heald, Steve M, Chambers, Scott A, Gamelin, Daniel R
Format Journal Article
LanguageEnglish
Published United States 21.07.2006
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Summary:The hypothesis that high-Curie-temperature ferromagnetism in cobalt-doped ZnO (Co2+: ZnO) is mediated by charge carriers was tested by controlled introduction and removal of the shallow donor interstitial zinc. Using oriented epitaxial Co2+: ZnO films grown by chemical vapor deposition, kinetics measurements demonstrate a direct correlation between the oxidative quenching of ferromagnetism and the diffusion and oxidation of interstitial zinc. These results demonstrate controlled systematic variation of a key parameter involved in the ferromagnetism of Co2+: ZnO and, in the process, unambiguously reveal this ferromagnetism to be dependent upon charge carriers. The distinction between defect-bound and free carriers in Co2+: ZnO is discussed.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.97.037203